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Abstract
The effect of voltage and electrolyte composition on the formation of TiO2 nanotube films over its morphology, semiconductor properties and photoelectrochemical performance for water oxidation was studied. TiO2 nanotube films were formed by potentiostatic anodization in 0.1 M H2SO4/0.05 M HF and 0.1 M H2SO4/0.05 M NH4F during 1 h at four different voltages. SEM images showed a more significant chemical attack when NH4F was employed, evidenced by larger tube diameters and thinner films. The semiconductor properties were altered by the nature of the counterEion utilized during film growth, obtaining films with a higher density of donor and less positive flat band potential in NH4F electrolytes. The films formed in NH4F showed higher photopotentials and photocurrent related to the modification of their morphology and semiconductor properties; attaining a maximum at formation voltage of 15 V.
Published Version
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